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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367aaad2a0a2037f17915a9e9654444ba7c9a49d1dbe68b750712c91f38f9f61' 
  AND token = 'x4QSRdHrGNRFHlI366aoLms1womn8sl119RgCZBuJRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}